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Early colonization of Posidonia oceanica (L.) Delile by epiphytes: Comparison between natural and artificial seagrass leaves
Pete, Dorothée; Gobert, Sylvie; Lepoint, Gilles et al.
2007In Pergent-Martini, Christine; El Asmi, Souha; Le Ravallec, Célia (Eds.) Proceedings of the third Mediterranean symposium on marine vegetation
 

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Keywords :
epiphytes; seagrass; colonization
Abstract :
[en] Posidonia oceanica is an important marine Magnoliophyta of the Mediterranean coastal zone that can form dense meadows. The leaves of this seagrass are colonized by a lot of organisms, from bacteria to polychaetes and algae. However, the early stages of colonization are not well known. A preliminary is proposed to examine the nine first days of colonization by epiphytes on natural leaves and on Artificial Seagrass Units (ASUs). Aims of this work were to understand which species are the first to set up, to compare colonization on both leaves and to determine the interest of ASUs in ecological studies. It was shown that the setting up of epiphytes on the bases of both leaves is rapid (first algae on the second day) but the number of organisms increases quicker on ASUs than on natural leaves and on the smooth faces than the rough ones. Shannon-Wiener diversity and evenness were higher for the P. oceanica leaves and the use of Bray-Curtis similarity index showed that colonisation is not similar (between 20 and 30 % similarity) on both leaves for the same day. It can be explained by the lower colonization rate of natural leaves. This lower rate is probably due to a less developed biofilm on natural leaves than on ASUs, to a difficult access to the bases of P. oceanica leaves for epiphytes and microoganisms, and the production of phenol compounds by the plant. Even if ASUs used here do not seem to be similar to natural leaves in early stages of colonization, they could be used in ecological studies thanks to their rapid covering by epiphytes.
Disciplines :
Environmental sciences & ecology
Aquatic sciences & oceanology
Author, co-author :
Pete, Dorothée ;  Université de Liège - ULiège > Département des sciences et gestion de l'environnement > Océanologie
Gobert, Sylvie  ;  Université de Liège - ULiège > Département des sciences et gestion de l'environnement > Océanologie
Lepoint, Gilles  ;  Université de Liège - ULiège > Département des sciences et gestion de l'environnement > Océanologie
Poulicek, Mathieu ;  Université de Liège - ULiège > Département des sciences et gestion de l'environnement > Ecologie animale et écotoxicologie
Bouquegneau, Jean-Marie ;  Université de Liège - ULiège > Département des sciences et gestion de l'environnement > Océanologie
Language :
English
Title :
Early colonization of Posidonia oceanica (L.) Delile by epiphytes: Comparison between natural and artificial seagrass leaves
Alternative titles :
[fr] Colonisation épiphyte précoce de Posidonia oceanica (L.) Delile: Comparaison entre feuilles naturelles et artificielles.
Publication date :
March 2007
Event name :
Third Mediterranean symposium on marine vegetation
Event organizer :
United Nation Environment Programme
Mediterranean Action Plan
Regional Activity Centre for Specially Protected Areas
Event place :
Marseille, France
Event date :
du 27 au 29 mars 2007
Audience :
International
Main work title :
Proceedings of the third Mediterranean symposium on marine vegetation
Editor :
Pergent-Martini, Christine
El Asmi, Souha
Le Ravallec, Célia
Pages :
151-157
Funders :
FRFC - Fonds de la Recherche Fondamentale Collective [BE]
F.R.S.-FNRS - Fonds de la Recherche Scientifique [BE]
Fondation de Recherches Sous-marines et Océanographiques
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